Embroidering-machine.



UNITED. STATES PATENT OFFICE.

rnur'rrrrns WILHELM SGHbNHERR,-OF PLAUEN, GERMANY, ASSIGNORS T voG'rLmIscHE MASCHINEN-FABRIK, or PLAUEN, GERMANY.

To ajZZ whom/it may concern:

Be it known that we, PAUL Trr'rns and Wmm'iLM SQHBNHERR, subjects of the Ger- The operation of shuttle embroidering machines is essentially the same as that of ordinary shuttle sewing machines, namely the needle pierces the fabric, the needle thread by a short retreatof the needle forms. a loop 1mder or behind the fabric, and while the shuttle is passing through the said loop the needle thread is slackened to permit the spacious shuttle to entirely slip through the loop.

But as soon as the rear end-of-the-shuttle has passed the l0op,,the slackened thread, while theneedle retreats, must be qu1ckly takenqup. After the adjustment of the fabric for, the next stitch, when the needle point againtouches the fabric, the thread is I slightly, tensioned in order to tighten the formed stitch and to simultaneously draw off so much thread'from the threa cl roller as corresponds to the particular length of stitch or ,the extent of the linear displacement of the'tambour'frame.

Fromthe above it is clear what importance 1 the thread t akeup.mechanism plays. Such mechanism must be constructed with great -exactness'soas to operate with precision and i 'a correctly apportioned force,;for otherwise fine embroidery can never ;be produced; The technical problem involved is ren- .dered .moredifiicult nowadays, when apart relief of the design suc 'fromthe needle" thread, a second, sometimes verythick thread or cord, is sewed onto the jembroidery, either as an ornamental cord or as'afilling to fame protrudingpart or leaves or the like'. I v

Becauseof the limited space on thermachine, the provisionsjof a, double set of the L hithertO used Itakerup mechanisms one for the ordinary needle. thread andfthe' other for g tliesecond jthreadorfcord,f woi1ld be very j Pi c bM-l utap r mama, h .50"

fabric in fnontiof the needle with particular care, especially when, as-is'more often the ond threadmustlbe handled 'and laid onthe case, the second thread is used as ornamental (cord? This .second thread, in a, greater measure thaiithe ordinary thread,being apt to for instance, as

EMBROIDERING-MACHIN'E.

Patented May 14., 1918.

Application filed January 19. 1916. Serial No. 73,060.

curl and form knots, must neverbe allowed to remain slack'and hang down, but on the contrary, must be always maintained at a uniform and gentle tension.

' To accomplish this effect and to. obviate the drawbacks of the hitherto used structures, is the object ofthe present invention,

according to which the second thread or cord is slackened and taken up always to the same "extent by means of a roller which for all j stitches is positively oscillated uniformly and the variable amount of thread required for the [particular 'length of stitch and determined by the linear displacement of the tambour frame is obtained by freeing the said roller for'just a moment while the thread is still held under gentle tension. In this manner the thread is given no opportunity whatsoever to ever curl, for even during the moment when the roller is free, the thread is 7 maintained under tension without which, obviously, the feeding of the necessary amount of thread for the length of the stitch is impossible.

'One embodiment of our inventiton is illus 30 trated more or less dia rammatically in the accompanying drawingm which similar reference characters denote corresponding parts and in which Figure 1 is a sectional side view of an embroidering machine equipped 35 with our new mechanism; Fig. 2 is an enlarged detail of our new mechanism and Fig. '3 is a sectional front view of the detail shown in Fig. 2.

In the drawing the tambour frame and fabric are indicated by line w-w in Fig. 1.

Projecting from; the casting or frame 1 of the machine are supports 2 and 3 for the different mechanisms. 4: is the main driving shaft from which by well known transmission means (not shown) motion is imparted to the difi'erent mechanisms, as for instance to the needle shaft 5 which reciprocates the bars 7 uniformly. arranged inahorizontal row over the entire length of the machine 1 and of which only one is shown in the drawing. Each bar 7 is provided with an arm 8 carrying the stitching needle 9. 10 and 11 are the well known take-up wires carried by J'the levers 12 and 13 respectively, and over which is wound the needlethread y leading from its respective spool 14 and passing over the emery rol1er215. :4 For each needle there is a presser foot 17 and for each ornamental or filling thread a a guide 21 of well known construction, which serves to lay the thread 2 on the fabric in accordance with a predetermined design. These presser feet 17 are fixed on a shaft 16. Each guide 21 is arranged on the end of a bar 20 which is guided by swinging levers 18 and 19 fixed respectively on the shafts 16 and 19 which receive short oscillatory motions from the driving shaft by suitable means (not shown),

Thus far the construction is old.

The feature constituting our invention is the following:

Each thread .2 coming from its respective spool 26 is conveyed to the respective guide 21 around a rigid rail 25, thence in contact with a thread feeler or tensioning Wire 24, thence once around a roller 23, and thence over a taut wire 22.

'1 he thread roller 23, in order to offer gentleresistance to the thread 2 need not, as the roller 15, be provided with an emery layer, but may be only covered, according to the nature of the thread with cloth, plush or velvet, as 23. In a similar manner the rail 25 may receive a covering 25 of cloth or the like. I

On the shaft or spindle 27 of the roller 23 are fixed two ratchet wheels 28, 29 with which respectively cooperate pawls 30, 31 pivoted on a common double armed lever 32 having its fulcrum on the spindle 27. When the lever 32 by means of a rod 33 is oscillated, the roller 23 by the pawls 30 and 31 will be caused to turn to and fro with equal degrees in both directions, indicated by the arrows u and v. The lever 32 is oscillated by means of a cam 35 which cooperates with aroll 34: rotatively fixed on the rod 33 and which is held in contact with the circumference of the cam by a spring 36 fixed at one end at 32 to one of the arms of the double armed lever 32 and at the other end, at 3, to the bracket The rod 33 is ivotally connected, at 33, to the lever 32. The cam 35, as shown, is in form of a circular disk arranged eccentrically on the driving shaft 1, thereby imparting to the/lever 32 uniform oscillatory movement. If other movements were desired, as for instance, when the mechanism is applied for the thread 3 the cam 35 may receive a' different confignration.

The dog'3l is extended beyond its fulcrum to form a thumb 37 which at the extreme end of the upper stroke of the lever 32 will be caused to strike against a projection or nose 38 of the frame, and thereby during the short period of contact between the parts 37 and 38 cause the dog 31 to free the roller23. It is just'during that short interval that the thread 2 finds opportunity at follow the displacement of the tambour frame to the amount required for the particular length of stitch. v

thread slackening and'take-up device, ,c'om- To obtain a very sensitive action of the pawls or dogs a double set thereof may be provided, as seen at 3.0, 30, 31, 31 (Fig. 3), in order thattheirpoints engaging the teeth of the wheels may, in well known manner, be'd'isplaced half a pitch relatively to each other. This amounts to the same as reducing the pitch of the teeth of thetwo Wheels 28, 29 to one half.

Th'e'tension' wire 24 is carried by small le vers 39 which freely swing on the spindle 39 and which are actuated by springs 40 having the tendency to draw them to the ri ht, v

Tfhe mode of operation is as follows:

The thread coming from the spool 26 and guided in the aforedescribe'd manner to ward the guides 21 is, in accordance with the operations of the guides 21 and the needles 9, periodically slackened and taken up to the same amount, owing to the oscillatory movementimparted to the roller 23 by the pawls 30, 31. But at a certain moment the thumb 37 strikes against the nose 38 and only for the moment of contact between the parts 37 and 38 the pawl '31 releases the roller 23 in consequence of which the latter by the pull of the thread 2 may freely turn in the direction indicated by the arrow 4) in Figs. land 2-.

, When the lever 32 swings downwardly the pawl'31, owing to the turn made by the roller 23, will engage the wheel 29 a few teeth below its former engagement, so that the thread unwound from the spool will-not. be subsequently taken up to the full amount: This amount of thread, which remains slack, is just that which is required by the linear displacement "of the tambour frame to produce the desired'length of stitch.

The piece of thread extending b tween the roller 23 and'the tension wire 2 11'Which in consequence of the free tum madeby the roller 23 is slackened will be instantaneously tensioned by the wire 24; which will be car ried fromlposition ate 6 by the action'of the springs 40 onthele ver39. v

Since the construction maygbe'variously modified without departing from the principle of our invention, we do not wish 'tolrestrict ourselves to the'detai'ls shown antidescribedf c What we claim and desire to secureby Letters Patent is: I V i 1. In ash'uttle embr'oidering machine, a

prising a positivelyand uniformly oscillated roller over whichthe thread is woundand means torelieve the, said roller for a short intervalto allow it to'turn freelyto furnish a I the amount, of thread required by the linear displacement of the tambou'r frame.

2. a shuttle embi'oideringmachine, a thread "slackening and takerupf device consistingjof a positively and uniformly oscillated roller over which the thread is wound, means to relieve the roller for a short interval and a thread tensioning device for constantly holding the thread on the said roller under tension.

3. In a shuttle embroidering machine, the combination with a spool, of a thread slackening and take-up device consisting of a positively and uniformly oscillated roller over which the thread is wound, means to relieve the said roller for a short interval, a rigid guide and a yielding guide, both said guides being interposed between said spool and the said roller and serving to constantly hold the thread on said roller under substantially uniform tension.

1. In a shuttle embroidering machine, a

thread slackening and take-up device consisting of a roller over which the thread is guided, means for positively oscillating said roller equally in opposite directions and means for relieving said roller for a short interval to allow it to turn freely and furnish the amount of thread required by the linear displacement of the tambour frame.

5. In a shuttle embroidering machine, a thread slackening and take-up device, consisting of a roller over which the thread is guided, ratchet Wheels connected to said roller, sets of oscillating pawls cooperating with said ratchet wheels and adapted to positively actuate said roller imparting to it uniform oscillatory motions and means whereby for a short interval the said roller is relieved and enabled to turn freely to furnish the amount of thread required by the linear displacement of the tambour frame.

6. In a shuttle embroidering machine, a thread slackening and take-up device comprising a roller over which the thread is guided, ratchet Wheels connected to said roller, sets of oscillating pawls cooperating with said ratchet wheels and adapted to positively and uniformly oscillate said roller, a stop and means on one of said pawls adapted at a certain moment to be actuated by said stop so as to relieve the said roller and to allow it to turn freely so as to furnish the amount of thread required by the linear displacement of the tambour-frame.

7. In a shuttle embroidering machine, a thread slackening and take-up device consisting of a positively and uniformly oscillated roller, means for relieving said roller for a short interval to allow it to turn freely and to furnish the amount of thread required by the linear displacement of the tambour frame and a thread tensiom'ng device which is adapted to constantly engage the thread and which is adapted to constantly hold-the thread under tension. 8. In a shuttle embroidering machine, a thread slackening and take-up device, consisting of a positively and uniformly oscillated roller, means for relieving said roller for a short interval to allow it to turn freely, a thread tensioning device and a thread guide, said roller and guide having both a covering of soft material constituting a resistance .for the thread.

In testimony whereof we aflix our signatures in presence of two witnesses.

PAUL TI'ITES. VVILLY SCHGNHERR. Witnesses Josnr GRAD, ROBERT H. NmR.

copies of this patent may be obtained for five cents each, by addressing the Commissioner of l'stents',

Washington, D. 0." 

